Welding in the Food Industry
Jay Petter – Quality Tank Solutions
Larry Hanson - CIP Concepts, LLC
Welding is Fundamental Process of Industry and the Economy
Welding in Food industry
Welding is a fabrication process used to join metals together using the heat of an electrical arc. The melting point of stainless steels is between 2417 and 2786 ⁰F (1325 to 1530 ⁰C) depend on the type of stainless.
Welding Circuit
WeldingMachine
WorkpieceGround Cable
Power Cable
Arc
Electrode
GTAW- Gas Tungsten Arc WeldingTIG Welding Machine
Controls• Voltage• Current (amperage)
TIG Welding Torch (electrode holder)
Shield Gas (Pure Argon)
Tungsten Electrode
Argon Gas for Shield Gas and Purge Gas
• Pressure Regulator• Dual Flowmeters
Hygienic Tubing
Manual and Orbital Tube Welding
Argon Purge of Tubing
TIG Tube Welding
Documentation & InspectionNo Cracks, Crevices or Pits
• Standards• AWS D18.1 -
• AWS D18.2 – Guide to Weld Discoloration of Sanitary Tubing
• AWS D18.3 – Welding of Tanks, Vessels and other Equipment is Sanitary Applications
• PQR – Procedure Qualification Record
• WPS – Welding Procedure Specification
• WOP – Welder Operator Performance Record
• Weld Coupons
• Boroscope
Good Orbital Weld
• Good Purge• Proper ID Weld
Oxidation Color• Full Penetration• Proper Convexity• Proper Concavity• Optimal Uniformity
Good Manual Weld
• Good Purge• Proper ID Weld
Oxidation Color• Full Penetration• Proper Convexity• Proper Concavity
High Hygienic Purged Tack
• Good Purge• Proper ID Weld
Oxidation (Color)
Good Non-Purged Tack
Tack not consumed
No Backup Gas Purge
ID Concave Weld
ID Concave Weld
Incomplete PenetrationOff-center
Incomplete PenetrationInconsistent Width
Incomplete PenetrationNarrow Weld Bead
Pit in weldAbrupt Tail-off
Sanitary Tank Welding
• Photo of tank
Tank TIG Welding Video
Tank Weld in Process
\Dye Penetrant Inspection
GMAW - Gas Metal Arc Welding Wirefeed (MIG) Welding Machine
GMAW Wirefeed Torch
Shield Gas (Argon Mixture)
WireElectrode
MIG Welding
MIG Weld
Laser Welding
Summary
• Written PQR, WPS and WOR’s
• Certified Welders
• Inspection for Cleanability
Questions